RFR: 8374469: Mixed jstack does not work on Windows [v7]

[Chris Plummer]

On Wed, 14 Jan 2026 06:06:28 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> When we run `jhsdb jstack --mixed` on Windows, we can see top of call frames only as following:
>> 
>> 
>> ----------------- 4 -----------------
>> "main" #3 prio=5 tid=0x0000021ee0357e90 nid=22356 waiting on condition [0x0000004ae7eff000]
>>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>>    JavaThread state: _thread_blocked
>> 0x00007ffca3c41c44 ntdll!NtWaitForSingleObject + 0x14
>> ----------------- 5 -----------------
>> 
>> 
>> This is long standing bugs since JDK 9 at least (maybe this includes older JDK releases).
>> We cannot depend on base pointer to unwind call frames, but SA do that.
>> 
>> This PR use [GetStackTrace](https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/dbgeng/nf-dbgeng-idebugcontrol-getstacktrace) to find caller frame, then native call frames would be unwinded.
>> 
>> However it has still problems for JIT'ed frames because it does not have a hint for unwinder like [RtlAddFunctionTable](https://learn.microsoft.com/en-us/windows/win32/api/winnt/nf-winnt-rtladdfunctiontable). But it would affect entire of JIT compilers, so I've limited the change to SA.
>> 
>> This change passed serviceability/sa tests on Windows 11.
>
> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update TestJhsdbJstackMixed.java

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29019#pullrequestreview-3667145976